JP2002079469A - Grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity by increasing the number of pieces of work machined by one grinding wheel. SOLUTION: A grinding wheel 3 for machining work 1 shaped into a shaft or provided with a radially expanded portion at one end of a shaft part has a plurality of grinding portions 2 spaced axially on the circumference of the body of the grinding wheel 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding wheel used for grinding a workpiece such as an engine valve by a grinding machine.

[0002]

2. Description of the Related Art An engine valve (1) as shown in FIG.
After being formed by hot forging, it is commercialized through various machining processes, which include cotter grooves (1a), chamfered shaft ends (1b), There is a step of processing the surface (1c), the umbrella portion outer peripheral surface (1d), the valve face portion (1e), and the like using a grinding machine.

Conventionally, each of the above-mentioned processing portions is formed by a single grinding portion (2) as in a processing example of a cotter groove (1a) shown in FIG.
With a grinding wheel having

[0004]

As described above, in machining with a grinding wheel having a single grinding portion, a predetermined number of workpieces are machined, and when the grinding portion wears out or the grinding wheel reaches the end of its service life. In such a case, it is necessary to modify the grinding section with a dresser or replace a CBN grinding wheel with a new grinding wheel each time. During that time, the machining of the work is interrupted, so that there is a problem that productivity does not increase. Was. In addition, since it is necessary to prepare a large number of replacement grinding wheels, the cost has been increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. By providing a plurality of workpiece grinding portions, the number of workpieces to be processed can be increased, and productivity can be greatly increased. The purpose is to provide a suitable grinding wheel.

[0006]

According to the present invention, the above-mentioned problem is solved as follows. (1) A grinding wheel for processing a workpiece having a shaft or an enlarged diameter portion at one end of a shaft portion, wherein a plurality of grinding portions are provided at predetermined intervals in an axial direction on an outer peripheral surface of a grinding wheel body.

(2) In the above item (1), the plurality of grinding portions are provided symmetrically with respect to a line which bisects the axial length of the grinding wheel main body.

(3) In the above item (1) or (2), the plurality of grinding portions are formed by a combination of a plurality of grinding portions having different shapes, which can process different processing portions of a work.

(4) In any one of the above items (1) to (3), the outer diameters of the plurality of grinding portions are sequentially changed in a stepwise manner.

(5) In any one of the above items (1) to (4), a second grinding portion is provided on the outer peripheral surface adjacent to each grinding portion so as to be able to simultaneously process different processed portions of the work.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention and shows a part of a grinding wheel (3) for processing a cotter groove (1a) of an engine valve (1).

In the center of the disk-shaped grinding wheel (3), a shaft hole for mounting on a rotating shaft of a motor of a grinding machine (not shown) is provided.
(4) is formed.

On the outer peripheral surface of the main body of the grinding wheel (3) to which the abrasive grains are fixed, a plurality (three) annular bulges in an arc shape forming a complement with the cotter groove (1a) to be machined. Grinding part (2)
Are formed stepwise at predetermined intervals in the axial direction so that the outer diameter of the right one gradually decreases gradually.

The dimensional difference between the outer diameters of the adjacent grinding parts (2) may be different when the cotter groove (1a) is machined by the grinding part (2) located on the left side. The shaft portion (1f) does not contact the right grinding portion (2).

The outer peripheral surfaces on both sides sandwiching each grinding portion (2) are tapered flank surfaces (5) (5) having a gradually decreasing diameter.
This prevents contact with the shaft portion (1f) during machining of the cotter groove (1a).

Like the grinding wheel (3) of the first embodiment, a plurality of grinding portions (2) are formed in a step-like manner so as not to contact the shaft portion (1f) of the engine valve (1). Each grinding unit
If tapered flank surfaces (5) are formed on the outer surfaces on both sides sandwiching (2), the cotter of the engine valve (1) chucked by the grinding machine as shown by the two-dot chain line in FIG. Groove (1
a) can be sequentially processed using the respective grinding units (2).

That is, when one grinding portion (2) is worn or has reached the end of its life, the engine valve (1) and the grinding wheel
By moving either one of (3) in the axial direction and the direction orthogonal thereto, and by sequentially pressing the cotter groove (1a) against another grinding part (2), the processing can be continued,
The processing quantity of the work by one grinding wheel (3) is greatly increased.

When all the grinding parts (2) are worn, the grinding parts (2) are modified by a dresser, or a new grinding wheel (3) is used.
Therefore, the frequency of these operations is smaller than that of a conventional grinding wheel having one grinding unit (2), and the operation rate of the machine is improved, and the productivity is significantly increased. The replacement cost of (3) is also reduced.

FIG. 2 shows a second embodiment of the present invention. A grinding wheel (6) is provided on both sides around a line (L) bisecting the axial length of its main body. On the outer peripheral surface, three stepped grinding portions (2) each having the same shape as above are formed symmetrically.

Assuming that the grinding wheel (6) of this embodiment is used, when all the grinding portions (2) on the right side are worn or have reached the end of their life, the grinding wheel (6) is once removed and turned over, and Since the cotter groove (1a) can be machined by using the three grinding units (2), the number of workpieces that can be machined by one grinding wheel (6) is greatly increased. The productivity is higher than that of the grinding wheel (3).

FIG. 3 shows a grinding wheel according to a third embodiment of the present invention.
(7), a chamfered portion of the shaft end of the engine valve (1) is provided on the outer peripheral surface of the grinding wheel body similar to that of the first embodiment, that is, on the outer peripheral surface on the left side of each grinding portion (2). A tapered second grinding part (8) for processing (1b) is added.

In the third embodiment, the same operation and effect as described above can be obtained. Also, since a plurality of two grinding portions (2) and (8) are provided on the outer peripheral surface of the grinding wheel (7), the cotter groove (1a) and the chamfered portion (1b) can be processed at one time, The number of processing steps can be reduced, and there is no need to manufacture a dedicated grinding wheel for processing the chamfered portion (1b), so that the cost can be reduced.

FIG. 4 shows a fourth embodiment of the present invention, and shows a grinding wheel (9) for processing an umbrella portion of an engine valve (1).

On the outer peripheral surface of the main body of the grinding wheel (9), a first grinding portion (10) for processing the outer peripheral surface (1c) of the umbrella surface of the engine valve (1);
A plurality of (three) step-shaped grinding portions (12) formed of a second grinding portion (11) for processing the umbrella portion outer peripheral surface (1d) are formed, and two grinding portions are formed.
According to (10) and (11), the outer surface of the umbrella surface (1c) and the outer surface of the umbrella portion (1d) are simultaneously processed.

Also in the fourth embodiment, one grinding unit
When (12) wears out or reaches the end of its life, machining can be continued using another grinding unit (12) in sequence, so one grinding wheel
The processing quantity of the workpiece according to (9) is greatly increased, and the productivity is also improved.

The first and second grinding units (10) and (11) provide
Since two processing parts can be processed at the same time, similar to the above,
The number of processing steps can be reduced, and the cost can be reduced.

FIG. 5 shows a fifth embodiment of the present invention, and shows a grinding wheel (13) for machining a valve face portion (1e) of an engine valve (1).

On the outer peripheral surface of the main body of the grinding wheel (13), a plurality (three) of grinding parts (14) forming a tapered surface having the same inclination as the valve face part (1e) are formed at regular intervals in the axial direction. ing.

Also in this embodiment, the grinding wheel (13) or the support (not shown) of the engine valve (1) is moved in the axial direction and the direction perpendicular thereto, so that each of the grinding portions (14)
As a result, the valve face (1e) can be sequentially and continuously processed, so that the processing quantity per grinding wheel is greatly increased, and the productivity is also improved.

FIG. 6 shows a sixth embodiment of the present invention. The valve face of the engine valve (1) is similar to the above.
(1e) shows a grinding wheel (15) for processing.

The grinding wheel (15) has its axis of rotation (O) inclined so as to be parallel to the valve face portion (1e), and its outer peripheral surface has a valve face portion (1e). And a plurality of (three) grinding portions (16) whose outer diameters are sequentially changed in a stepwise manner, are formed stepwise.

Also in the sixth embodiment, the engine valve (1) is moved in the direction of the axis and the direction orthogonal thereto, or
Or, if the grinding wheel (15) side is moved in the direction orthogonal to the axis and the axis, the valve face portion (1e) by each grinding portion (16).
Can be continuously processed, so that the number of processed workpieces per grinding wheel is greatly increased and productivity is also improved.

FIG. 7 shows a seventh embodiment of the present invention. On the outer peripheral surface of a grinding wheel (17) main body, a right side centering on a line (L) bisecting the same is shown. A plurality of grinding portions including a grinding portion (2) for processing the cotter groove (1a) and a second grinding portion (8) for processing the chamfered portion (1b) are formed in a step-like shape, and a left outer peripheral surface is formed. In the umbrella part outer peripheral surface (1d) multiple grinding parts (18) for processing
Are formed stepwise.

Also in this embodiment, different parts of the work can be machined by one grinding wheel by inverting and using the grinding wheel (17), so that a plurality of grinding wheels are manufactured for each machining part. There is no need to reduce costs.

FIG. 8 shows an eighth embodiment of the present invention, in which the same cotter groove (1a) and grinding for processing the chamfered portion (1b) are formed on the outer peripheral surface of the grinding wheel (19). (2) (8) and a plurality of grinding parts (18) for processing the outer peripheral surface (1d) of the umbrella part
Are alternately formed around a line (L) bisecting the grinding wheel (19). In the eighth embodiment as well, the seventh embodiment
The same operation and effect as the embodiment can be obtained.

In the seventh and eighth embodiments, the combination of the grinding parts may be changed according to the processing part of the work.

Although not shown, each of the grinding wheels in the third to sixth embodiments may be symmetrical as shown in FIG. 2 to further increase the productivity. Further, in each embodiment, three grinding parts are provided, but it is needless to say that more grinding parts may be provided.

The present invention is not limited to the processing of the engine valve described above, but is also applicable to the processing of a workpiece having an annular groove at the center of the shaft, a workpiece having an enlarged diameter portion or a tapered portion at one end of the shaft. Needless to say.

[0039]

According to the first aspect of the present invention, even if one grinding portion is worn, a different grinding portion can be used without replacing the grinding wheel or modifying the grinding portion each time. As a result, the number of workpieces processed per wheel can be greatly increased, and productivity can be increased. Also,
It is economical because there is no need to prepare a large number of replacement grinding wheels.

According to the second aspect of the present invention, even if one of the plurality of grinding portions is worn, the grinding wheel can be once removed and turned over, and processing can be continued using the other plurality of grinding portions. The number of workpieces processed per grinding wheel is greatly increased, and productivity is further increased.

According to the third aspect of the present invention, different processing portions of a workpiece can be continuously processed by one grinding wheel.
It is not necessary to manufacture a grinding wheel having a different shape for each processing portion, and cost can be reduced.

According to the fourth aspect of the present invention, when an annular groove is formed in the shaft portion, the outer peripheral surface of the shaft portion other than the processed portion can be easily processed without contacting another grinding portion. it can. Further, the amount of movement of the work or the support of the grinding wheel may be minimized, and the movement control system is simplified.

According to the fifth aspect of the present invention, since two processing portions can be simultaneously processed at one time, the number of processing steps is reduced, and it is not necessary to individually manufacture a grinding wheel for each processing portion. Will be economical.

[Brief description of the drawings]

FIG. 1 is a plan view showing a part of a grinding wheel according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a part of the second embodiment.

FIG. 3 is a plan view showing a part of the third embodiment.

FIG. 4 is a plan view showing a part of the fourth embodiment.

FIG. 5 is a plan view showing a part of the fifth embodiment.

FIG. 6 is a plan view showing a part of the sixth embodiment.

FIG. 7 is a plan view showing a part of the seventh embodiment.

FIG. 8 is a plan view showing a part of the eighth embodiment.

FIG. 9 is a plan view of an engine valve processed according to the present invention.

FIG. 10 is a plan view showing an example of processing a cotter groove by a conventional grinding wheel.

[Explanation of symbols]

 (1) Engine valve (1a) Cotter groove (1b) Chamfered portion (1c) Outer surface of umbrella surface (1d) Outer surface of umbrella portion (1e) Valve face (1f) Shaft (2) (12) (14) ( 16) (18) Grinding part (3) (6) (7) (9) (13) (15) (17) (19) Grinding wheel (4) Shaft hole (5) Flank (8) (11) 2 grinding unit (10) 1st grinding unit

Claims (5)

[Claims] 1. A grinding wheel for processing a workpiece having a shaft or an enlarged diameter portion at one end of a shaft portion, wherein a plurality of grinding portions are provided at predetermined intervals in an axial direction on an outer peripheral surface of a grinding wheel main body. A grinding wheel characterized by that. 2. The grinding wheel according to claim 1, wherein the plurality of grinding portions are provided symmetrically about a line bisecting the axial length of the grinding wheel main body. 3. The grinding wheel according to claim 1, wherein the plurality of grinding portions are formed by a combination of a plurality of grinding portions having different shapes capable of processing different processed portions of a workpiece. 4. The grinding wheel according to claim 1, wherein the outer diameter of each of the plurality of grinding portions is sequentially changed in a stepwise manner. 5. The grinding wheel according to claim 1, wherein a second grinding portion is provided on an outer peripheral surface adjacent to each grinding portion so as to simultaneously process different processing portions of the workpiece.